Abstract
A system designed for making field measurements of wind action on engineering structures is described. The system is composed of sonic anemometers, differential pressure sensors, a barometer, and a thermohygrometer. The focus of this study is to determine the indications of sonic anemometers; to accomplish this goal, wind tunnel tests were performed. The tests did not involve checking the accuracy of the devices themselves, but determining their indications under field measurement conditions where certain unavoidable errors resulting from their installation can appear. The anemometer measurement uncertainty with respect to wind speed and angle was determined. The devices were rotated in a horizontal plane and inclined against and with the mean wind speed direction in a wind tunnel. Different tunnel wind speeds were tested. The results indicate stable device readings at different horizontal plane positions at different wind speeds and a low sensitivity to changes in inclination against the inflow.
Highlights
Environmental engineering, especially wind engineering, uses three kinds of experiments: in situ measurements, model tests in climatic chambers or wind tunnels, and computational fluid dynamics (CFD) simulations
The devices were rotated in a horizontal plane and inclined against and with the mean wind speed direction in a wind tunnel
The results indicate stable device readings at different horizontal plane positions at different wind speeds and a low sensitivity to changes in inclination against the inflow
Summary
Environmental engineering, especially wind engineering, uses three kinds of experiments: in situ measurements, model tests in climatic chambers or wind tunnels, and computational fluid dynamics (CFD) simulations. Measuring climate parameters, including wind speed and direction, at full scale is quite challenging, especially under construction site conditions. To carry out such measurements, commercially available devices are used, or an adequate measuring system is built on the basis of these. Are employed to study the effects of wind [2,3,4], whereas accelerometers or global positioning system (GPS) devices [5,6,7] are often necessary in dynamic tests of civil engineering structures These types of measuring devices or systems are typically used to monitor the behavior of existing structures and are used much less frequently in the design stage. The use of unmanned aircraft systems, including both airplanes and drones, gives new possibilities in measuring wind speed and direction and other environmental parameters. Sensitivity analyses of the results to possible inaccuracies in sensor assembly or rapid changes in flow speed are presented
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